Roasting-furnace.



J. B. P. HERRESHOFF.

BOASTING FUBNAGE.

APPLIOATIGN FILED APB. 12, 1912. 150535,41 9. Patented Jan 27, 1914 J. B. F. HBRRESHOFP.

ROASTING FURNAGE.

APPLICATION FILED APR. lz, 1912.

108541 9, Patented Jan. 27,1914.

2 SHEETS-SHEET 2.

ATTORNEYS ber on thell1ne.6*6 of Fig. 5, the rabble perspective; wiew't erm members which the intense heat of R5 thereof which is y, ing drawings 1n whichan elevation of a porti the rabble arm attach y an ernten; 1 y anni: s. r. nnnnnsnorr, or Nearthy-chain"` l ro NIoHoLs'ooPrnn co., or NEW Yon N. Y., nssiGNor., BY'M n, N. Y., A ooaroianrio ROAS-TING-FURNACE.

glg, Speciicaton of Letters Patent.

Application led April l2, 1912. Serial No. 590,222. 1b all :whom t may concern: of one of the central member sections, `113e 1t known that JoriN B. F. Hnnens- 9 is a detail view similar to that of Fig. 8, HOFF, a itlzen of the United States and a but showing the lower surface of the `co-` resident of the borough of Manhattan, city, operating attachingflange and Fig. 1Q. is county, and State of New York, have inan enlarged sectional detail ofthe arm'and vented certain new and useful Improvements in Roasting-Furnaces, of which the follow- @g is a specification.

yinvention relates to roasting urnaces aces for roasting wn in .my Patent ted November 22,

shaft connection, sho position of' the insulating material. It will be understood that, th l.

which my invention is a a series of superimposed port the ore or other material to be treated. rl`he hearths are provided with apertures for the passage of ore and of evolved gases al;

wingv particularly the e'type sho @numbered 976,175 and da i910.

tk-ne of the objects o f my invention is to ternately near the center and the nsNn ASSIGNMENTS, I N or NEW YORK; ,y

Patented 1111.221914. v

pplicable comprises hearths which supincrease the life and ethciency of such furthereof, nd are further provided'with cen-r nace by so constructing the central rotating tral openings through which extends a cenmember and the rabble arm members that, tral member rotatably `supported'above and.

below the hearths in suit tached to this member ab rabble devices equipped in the which are adapted to' exte be treated. The rabb larly disposed so that the central member th hearth move the ore t ward the opening in which opening it falls hearth.

The centra the drawings ed by a concentr sleeve may be o held in separated, concentric relationl by strengthening ribs 3. At th tachment of the rabble arms,\the walls ofl the sleeve extend inwardly so as to fornirecesses or pockets 4 from th 5 of which extends outwardl semi-circular flange 6. The ,vided with slots 7 for the rec 8 the heads of which are'adaptedto be positioned in suitable pockets i tween the slotstherein and the inner wall-5.l These pockets extend outwardly in the direc,- ltion of the yslots 7 tothe peripherywof the flange 6, as particularly shown dotted in LF ig. 3, and are Shaped internally s0 thattthe. `bolt heads are hel flange 6 is provided with a central-vertical partition 9 which, together with ithegwallsi of the 'flange on yone side ofsaid. pritltiomp.; extends to the shaft l to form afpssagegl nts of connection, they able bearings. At. t a lower temperature especially at their poi may be maintained a than heretofore.

Another object 1'means between th comprising rabble arms( is to provide connecting e central member and thc shall be protected from the furnace and at the same time be easy of access for removing and attaching the arm members.

Another object is the provision of con- .-iiecting means for furnace elements, which may be insulated from the heat of the furnace by a suitable heat insulating medium.

@ther objects of my invention will be pointed out or will otherwise appear in the following description of one embodiment shown in the acffrrill)anysy nd into the ore to les are usually anguupon the rota-tion'- of e rabbles above each said hearth, through ic sleeve 2. The shaft and Figure l shows 'in side elevation a portion l of the central rotatable member of a furnace of the type mentioned, with vrabble arms attached theretoJjFig. 2 is a plan view of the mechanism sho'wn in Fig. 1, Fig.` 3ds;

on of the central member with the rabble arm` removed, F ig. eis.' an elpvation similar to 'that of Fig'. 3 with ed and broken ofle near the attaching flange, Fig- 5 shows in vertical section on the line 5 5 of Fig. 6 a portion nf the central member and attached rabble arms, Fig. Gis a section of the central memy a. substantially fiange 6 is pro-- arms appearing inI upon thenext lower..

ove thehearths-are, i

usual manner with rabbles hereon gradually to-V l rotatable member shown 1n comprises a shaft l, surround-f y v f integral construction and 1 e lpoints of ati e innermost walls feption of bolts y i inthe fiangejbef' f to 'connect the cned by means of lugs shaft With the recess The opposite side of the flange .is formed into a .passage 11 to establish communication loetween the interior of the sleeve 2 and the recess. The Walls of the recess 4 are strength- 12 Within the sleeveZ.

Each rabble arm 13 is provided at its inner end with a substantially semi-circular flange 14 and with a central vertical partition .15

the 'central member, the partition 15 abutl tral member and -the rabble arms and upward' direction so Wall 5 on one sectionl and the heads in re- 9. In this position the ting the partition is situated entirely Withl'lange of each arm in the recess 4. A y The flange 14 of each arm is provided IWithislots 18 which extend to the lperiphery of the flange in a generally upward direction similarly to the corresponding slots 7 inl the flange of the central rotatable member. These slots 7 and l18 are of sufficient Width to accommodate the Shanks of the bolts 8 and are angularly disposed in a generally .easily `removed into and furthermore so that an insulating material may be readily applied to them. i

The outer face of-e'ach flange'14 is pro# vided With a plurality of recesses 19 eaclr substantially concentric with the axis of a bolt 8 `when positioned at the bottom of its slot, and. of suitable-size to receive a nut for the bolt and a suitable tool for turningy the nut. When 'tightened into place, the .nut is adapted to seat. upon the bottom 20 of the recess and is in effect embedded Within the flange. A portion of thelongitudinal Wall of the recess is undercut as at 21.

The central rotatable member is preferably made in sections,.as shown in Fig. 5, and these sections are provided with terminal external flanges 22 and 23 through which fastening means extend .to secure they sections together. The fastening means preferably comprise bolts 8 coperating With the flanges, the bolt nuts being inserted into pockets formed by the flange and abutting cesses in the other section. The Wall 5" 1s similar in function to the Wall 5 and the recesses may be similar to the recesses in the flange 14, previously described. The pockets open laterally of the bolt4 and the recesses longitudinally thereof.

In the operation of the furnace, the cenassocated parts are subjected to an intense heat that the bolts may be out of position andtinu ally ba hand, but

Losa/119 under which the various means for connecting parts together. are aptto be destroyed.

lA circulation of cpoling fluid, preferably air,

cooling is maintained for the purpose of these parts. The air is lfirst caused to traverse the shaft 1 from which it passes, in the case of each arm, successively through the passage 10, 16, 17 and 11 into the sleeve 2 from which -itisremoved The circulation may be obviously caused either` by a suction or a pressure device. The central member and its associated rabble arms are preferably rotated in practice in the direction shown by the arrow in Fig. 6. Owing .-to the resistance to turning offered by the material treated, the rabble arm flanges 14 are pressed with great force against the flanges 6 in the neighborhood of the passages 11 and 17 and there is a corresponding tendency to pull these flanges apart on the opposite side of the'partitions 9, that is,in the neighborhood of the passages 10 and of vheat from the hearths to the interior of the sleeve 2 is facilitated on the first-men tioned side because of the lintimate contact thus produced between the flanges. '-On the opposite side, however, the .conduction is obviously less perfect, but this side is nevertheless maintained at a proper low tempera-l ture by conducting the cold air from the shaft`1 directly by means of the passage 10 to the point at Which the flanges tend to draw apart. This location of the inlet and outlet passages 10 and'11 respectively', with regard to the direction of rotation of the central member forms an important feature of my invention.

.The'p the central member is situated Within the recess 4, the walls of which are materially cooled because their inner surfacesare conlow temperature relatively to that -of the atmosphere outside of the sleeve. The connectingmeans is further'protected by a suitable insulating material 24 (Figs. 1 and 10) which, on account of the structure described, may be packed around the bolts, the bolt heads and nuts. The undercut portions 21 of the flange 14 obviously prevent the packingfro-m being displaced. VIf desired, the packing may be inserted sofas completely to .fill the recesses 4. As a packing, asbestos or other poor conductor of heat may be.` used. In some cases it may. not be necessary to insert an insulating'h material by the ore dust whic in the furnace may serve as such insulating material. The inclination of thebolt slots is such that descending dust will readilyiill them `and the 21 furthermore,

oint of connection" of the arms andV accumulates 16. The conduction tlied by the air flowing V11n the Y sleeve 2. This air manifestly is at a very bolt head. and nut recesses, y. and be held therein. The undercut portions,I as will be seen, especially openings in the hearths sented. The cooling of the various furnace parts at the points 0f connection thereof is further enhanced by making the holt Hanges The. fas tening bolts are thus relatively small and contact with each other Withking or other separating medium pre erably made integral with the furnace parts to which they are attached, so that the best possible conducting path is produced between relatively hot and relatively cool portions of the furnace.

The insulating material is obviously applicable to the connecting means for the sections of the central member in the same manner as for the connecting means described above, and it is to be understood that the insulated connection is applicable to other parts of the furnace as Well as those specically pointed out. he connections between the rabble arms and the central member being all Within the recesses 4 it is obvious that the sections may be readily removed through the central Without interference y said connections.

Instead of the bolts shown it will be understood that any other suitable securing clalm:

l. In a roasting furnace, the combination of a central rotatable member provided with a recess, a rabble arm extending into said recess, the portion of said arm Within said ortion of the rabble arm, and means Within said operatively accessible through said space for detachably securing said arm to said member.

2. In a roasting furnace, the combination of a central rotatable member provided with a recess, the inner vWall of said recess being provided With an outwardly extending flange, a, flanged rabble arm extending into said recess and abutting said first mentioned ange and means coperating with said flanges for securing said arm to said mem- 3. In a'roasting furnace, the combination of a central member comprising a hollow shaft and a sleeve surrounding said shaft and` spaced. therefrom, said sleeve being rolof a central rotatable memb communication between the `recess and the shaft and sleeve respectively, a 1

end of the arm andin communication each other near the outer end of the arm, and

means Within the recess for securing said rabble arm to said central member.

' furnace, the combination of abutting furnace members provided with securing flanges, a. flanges to secure said members together, one of said flanges being provided with a recess for one of the bolt-head,s, the other of said flanges being provided with a recess for the other bolt head and heat insulating material in said recesses.

5. In a roasting furnace, the combination of abuttin furnace members provided with securing anges, a bolt coperating with said flanges to secure said members together, one of said lian es being provided with a recess for one o? the bolt-heads, extending longitudinally of the bolt,

anges being provided recess for the other bolt head and heat in: sulating material in said recesses.

n a roasting ond-mentioned flange to cover and protect bolt from heat. ln a roasting furnace, the combination of a central rotatable member provided with a slotted iiange and a Wall separated from said flange, a rabble arm abutting said central member and provided with a flange hav-y ing a recess and a slot in alnement With the slot of said tiret-mentioned flange, a bolt seated in said slots and securing said member and said arm together, and insulating material in the space between said Wall and said first mentioned flange, in said slots and in said recess for covering and prctecting said bolt from heat.' f.

8. ln a roasting furnace, the combination er comprising a hollow shaft and a sleeve surrounding said shaft and device secured to and rotatable wit-hsaid member, said rabble devicek being providedv with passages in, communication with each' other near the outer end .of theidevicarand said member being providediwith'a passage establishing communication between Si said shaft and` x e passage ofthe rabbledevceoef spaced therefrom, and.la)rabble provided with channels incom'-f munication with said passages at the innen,

ico

that"side of sai l device which, during ro- I In testimony whereof I have hereunto set tation, is subjected to tensile strains due to' vmy hand in the presence of two subscribing the resistance to rotation offered by said Witnesses.

material, said member being further pro- JOHN B. F.HERRESHOFF. 5 vided With a passage establishing communi- A Witnesses:

cation betweensaid sleeveand the other of H. H. SToUT,

passages in said rabble device. J. Y A. FERGUSON. 

